Hazardous Voltage Indicator; Flexible Current Probe; Auto Power Off - Fluke 381 User Manual

381
Users Manual

Hazardous Voltage Indicator

During a voltage measurement, the Meter alerts you to the presence of a potentially hazardous
voltage. When the Meter senses a voltage ±30 V or a voltage overload (OL), Y is shown on the
display and the red high-voltage LED (
voltage is at the Meter input.

Flexible Current Probe

To prevent electrical shock, do not apply or remove from live hazardous
conductors.
The high-performance AC Flexible Current Probe utilizes the Rogowski principle and is used
for accurate, non-intrusive measurement of sinusoidal, pulsed, and other complex waveforms.
The flexible and lightweight measuring head allows quick and easy installation in hard-to-reach
areas and works well with large conductors.
For more information about the Flexible Current Probe, see
Probe).

Auto Power Off

The Meter powers off if there is no button push or Rotary Function Switch operation for
20 minutes. Auto Power Off is disabled during Min Max Avg function use. To disable the Auto
Power Off, hold down
Units with Firmware Version <0.9
If the Meter powers off, turn OFF the Rotary Function Switch and then back on again.
Units with Firmware Version ≥0.9
If the Meter powers off:
1. Dock the Display Module to the Meter base.
2. Turn the Rotary Function Switch to OFF.
3. Turn the Rotary Function Switch to any function to turn on the Meter.
4
) on the Meter base illuminates to tell you a hazardous
U
XW Warning
while you turn on the Meter.
Z
AC Current (Flexible Current